05-04-2007, 10:11 PM
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First, apple snails incorporate a few varieties of pomacea. Pomacea bridgesii (mystery snail) grows the size of a golf ball and will not eat your plants. Pomacea canaliculata (canas) grows the size of a softball and will gorge themselves on ANY greenery they find. There's also paladosa and haustrum but these hard much harder to come by. Canas like leafy greens in particular but they and mysteries need veges to eat as well as algae wafers, fish flake, etc.
You should allow at least 2 - 2 1/2 gallons of water per full grown mystery snail and about five gallons for canas. They need that much room because they are big eaters, and thus, big poopers. If you have great filtration and do frequent water changes, you can allow for more.
Snails are wonderful nannies for fry of any kind that need infusoria. At least poop is good for something. :) They will not harm babies.